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Years ago, in simpler times, if you wanted to buy a pH sensor from Vernier, there was one choice—the Vernier pH Sensor. These days, you have five options (including, still, the Vernier pH Sensor). All of our pH sensors have similar accuracy, response, and sensitivity, so which one should you buy? It depends on how and where you plan to use your pH sensor. Here is some information to help you choose wisely.